Where was One on Top of the Other filmed?

1969 film directed by Lucio Fulci

One on Top of the Other (1969) was filmed in New York City, San Francisco, Sacramento, Reno, San Luis Obispo, Cinecittà and 1 more place, 7 places named in its Wikipedia article, in the United States, Italy. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.

See them on the map → Wikipedia Source data